Correct borrow, and impl Send for RawIter #536
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Fun note I just realized: if we are iterating in an async context, the items yielded by the iterator ( |
jamesmunns
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…r types Unfortunately as we are holding NonNulls across await points, we'll still need some kind of adapter to mark this as sound. This means that hawkw/mycelium#536 is not in and of itself sufficient. Comments have been updated to reflect this.
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(I still think we should merge this, in case some users don't need to hold the yielded ptrs across await point, and to fix the &mut soundness hole). |
hawkw
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Dec 27, 2025
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okay yeah we should probably just merge this, thanks and sorry i forgot about it for, uh, 7 months... 😅
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Fixes #535
This change fixes the two things noted in the #535: RawIter now holds an
&mutto the List, and also now implements Send.I think we could also implement Send for Iter/IterMut, but I'm less confident about that.
I also am not certain whether the unsafe
Sendimpl should be gated onT: Send, I opted not to because we never take ownership of a node (e.g. apop) using the RawIter interface, so we're only ever "visiting" a pinned node, so requiringT: Senddidn't seem necessary. I'm open to more confident logic around that.I also added a util helper to assert that RawIter remains Send.